How to extract xml attribute values using awk inline.?

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How to extract xml attribute values using awk inline.?

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06-04-2016

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How to extract xml attribute values using awk inline.?

I am trying to extract specific XML attribute values for search pattern <factories.*baseQueueName' from resources.xml.
my scripts works ok,, but to extract 3 values this code does echo $line three times, it could be 'n' times. How can I use awk to extract matching pattern values in-line or efficiently than I am doing.

Code:

resources.xml
    <factories xmi:type="resources.jms.mqseries:MQQueue" xmi:id="MQQueue_11111" name="Queue1" jndiName="jms/Queue1" description="Queue1" category="TEST" persistence="APPLICATION_DEFINED" priority="APPLICATION_DEFINED" specifiedPriority="0" expiry="APPLICATION_DEFINED" specifie dExpiry="0" baseQueueName="TEST.QUEUE1" baseQueueManagerName="" useNativeEncoding="false" integerEncoding="Normal" decimalEncoding="Normal" floatingPointEncoding="IEEENormal" targetClient="JMS" queueManagerHost="" queueManagerPort="0" serverConnectionChannelName="" userName="" password="{xor}" readAhead="NO"/>
	
    <factories xmi:type="resources.jms.mqseries:MQQueue" xmi:id="MQQueue_22222" name="Queue2" jndiName="jms/Queue2" description ="Queue2" category="TEST" persistence="APPLICATION_DEFINED" priority="APPLICATION_DEFINED" specifiedPriority="0" expiry="APPLICATION_DEFINED" specifiedExpiry="0" baseQueueName="TEST.QUEUE2" baseQueueManagerName="" useNativeEncoding="false" integerEncoding="Normal" decimalEncoding="Normal" floa tingPointEncoding="IEEENormal" targetClient="JMS" queueManagerHost="" queueManagerPort="0" serverConnectionChannelName="" userName="" password="{xor}" readAhead="NO"/>

# .. around 20+ similar lines like above.

Code:

	
grep '<factories.*baseQueueName' resources.xml | while read line; do
	QUEUE_JNDI_NAME=$( echo $line | grep -Po 'jndiName=\D\S+\D'      | cut -d'"' -f2 )
	BASE_QUEUE_NAME=$( echo $line | grep -Po 'baseQueueName=\D\S+\D' | cut -d'"' -f2 )
	QUEUE_NAME=$(      echo $line | grep -Po 'name=\D\S+\D'          | cut -d'"' -f2 )
	echo "$QUEUE_JNDI_NAME,$BASE_QUEUE_NAME,$QUEUE_NAME"
	done

output:

Code:

jms/Queue1,TEST.QUEUE1,Queue1
jms/Queue2,TEST.QUEUE2,Queue2
# .. around 20+ similar output lines like above.

Last edited by kchinnam; 06-04-2016 at 10:27 PM.. Reason: formatting

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06-05-2016

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Maybe you want something like:

Code:

awk '
BEGIN {	dqsERE = "\"[^\"]*\""
	EREs[++nEREs] = " jndiName=" dqsERE
	EREs[++nEREs] = " baseQueueName=" dqsERE
	EREs[++nEREs] = " name=" dqsERE
	for(i = 1; i <= nEREs; i++)
		offset[i] = index(EREs[i], "=") + 1
}
/<factories.*baseQueueName/ {
	out = ""
	for(i = 1; i <= nEREs; i++) {
		if(match($0, EREs[i]))
			out = out substr($0, RSTART + offset[i],
				RLENGTH - offset[i] - 1)
		out = out ((i < nEREs) ? "," : "")
	}
	print out
}' resources.xml

As always, if you want to try this on a Solaris/SunOS system, change awk to /usr/xpg4/bin/awk or nawk.

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Would this do it?

Code:

perl -nle '@r=/(?:jndiN|baseQueueN|n)ame="([^"]+)/g and print join ",",@r[1,2,0]' resources.xml

Output:

Code:

jms/Queue1,TEST.QUEUE1,Queue1
jms/Queue2,TEST.QUEUE2,Queue2

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Aia, thanks for trying,, I knew a wicked one liner like you gave could do this..
Don, please check performance stats,, I am bash/awk lover,, we have work to do..

Code:

 
grep '<factories.*baseQueueName' resources.xml | perl -nle '@r=/(?:jndiN|baseQueueN|n)ame="([^"]+)/g and print join ",",@r[1,2,0]'

Code:

# 153 XML tag lines scanned from one resources.xml file. time <command> gives these stats
real    0m0.007s, user    0m0.004s, sys     0m0.002s  -- Perl solution OMG
real    0m0.028s, user    0m0.025s, sys     0m0.002s  -- Don's awk solution
real    0m0.928s, user    0m0.458s, sys     0m0.409s  -- My general public :-) solution. Why sys taking so long here! not fair.

is there a way to combine first regex '<factories.*baseQueueName' into second one as well?

I wonder if any basic shell commands like sed/awk/grep can match what you are able to do with perl.. I would love to see simplified awk solution to beat perl.

Last edited by kchinnam; 06-05-2016 at 02:10 AM.. Reason: more details

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I asked you if it would work, because <factories.*baseQueueName appeared to me, quite a long regex to verify a line. However, if you really need it, grep is not necessary.

Code:

perl -nle '/<factories.*baseQueueName/ and @r=/(?:jndiN|baseQueueN|n)ame="([^"]+)/g and print join ",",@r[1,2,0]' resources.xml

or, if the order of the strings are always the same:

Code:

perl -nle '@r=/<factories.*name="([^"]+)"\sjndiName="([^"]+)".*baseQueueName="([^"]+)/ and print join ",",@r[1,2,0]' resources.xml

Last edited by Aia; 06-05-2016 at 02:48 AM.. Reason: Add one regex

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performance is same with in-line first part of regex in perl vs grep + perl.

Can you explain what is the meaning of below two expressions in your command?

Code:

'?:' 
"([^"]+)

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Quote:

Originally Posted by kchinnam

[...]
Can you explain what is the meaning of below two expressions in your command?

Code:

'?:' 
"([^"]+)

(?:) does not create a captured group. Anything inside () would be saved into a group; we do not want that sometime, (like in that occasion).
"([^"]+) match a " and keeps matching, as a captured group, anything until it meets another ". That last " is not included in the group.

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